Washington Post political blog, "The Fix," by Chris Cillizza
Parsing the Polls: Presidential Erosion
....The president's job-approval rating has dropped in every region of the country, level of income, education level, and age group, but the slippage is particularly pronounced among self-identified moderate Republicans. Eighty-one percent of this group gave the president positive marks in December, while just 56 percent did the same in May -- a precipitous 25-point decline that outpaced the 20-point drop (89 percent in December '04, 69 percent now) among Republicans overall.
The numbers are less stark when it comes to President Bush's conservative base, but perhaps even more worrisome for Republicans hoping to hold the House and Senate in the fall. The president's job approval among self-identifying conservatives has slipped from 93 percent in December 2004 to 78 percent in May. But Courtney Kennedy and Michael Dimock, authors of Pew's own analysis, pointed out...."There are far more conservatives than moderates in the GOP; as many as two-thirds of Republicans identify themselves as conservatives," the duo wrote. "Translated into real numbers, just as many conservative Republicans as moderate and liberal Republicans have grown frustrated with the president's leadership over the past year and a half."
As evidence of the erosion in what has long been considered Bush's base, take a look at his job-approval numbers among white evangelical protestants. In December 2004, 77 percent of this voting bloc approved of how the president was handling his job; the numbers wad down to just 55 percent in May. Among Southern voters, Bush's job approval has dropped twenty points (56 percent in December 2004, 36 percent in May 2006); among those who attend church weekly or more often it has slipped 17 (58 percent to 41 percent.)...
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Two other numbers of note -- both from voting groups considered to be up for grabs in 2006. Among Hispanics, Bush's job approval has dropped 16 points (45 percent to 29 percent). Meanwhile, just 26 percent of self-identifying independents approve of his performance, a 19-point fall-off from December 2004....
http://blog.washingtonpost.com/thefix/2006/06/parsing_the_polls_presidential.html#more